Papers

EFFECT OF HARVESTING TIME ON GROWTH AND TUBER FORMATION IN PROCESSING POTATO (Pages : 17 - 25)

N. MOKARROMA, I.M. AHMED, A.K.M. ZONAYED-ULL-NOOR AND K.A.M.M. RAHMAN

An investigation was carried out in three processing potato varieties such as Asterix, Lady Rosetta and Courage to study the growth and to evaluate the tuber formation. Among morphological parameters reduction was observed at later stages of growth than that of earlier stages. In case of growth parameters the relative growth rate (RGR) decreased with advancement of growth in Asterix, Lady Rosetta and Courage. The major differences in the net assimilation rate (NAR) among the cultivars occurred at the time of tuber initiation and development at 40 days after planting (DAP). Relative tuber growth rate (RTGR) of the varieties declined sharply which indicated the early maturation. Thus, the minimum photosynthates were produced and the maximum of it was used for respiration which reduces the rate of RTGR. Among the yield attributes, tuber number and tuber dry weight per plant showed increasing trend at later stages of plant growth than the earlier stages. Importantly, Asterix gave greater yield followed by Courage however, Lady Rosetta gave lowest yield. In the study it was observed that the yield of tuber harvested at 80 DAP and 100 DAP is lower than that of harvested at 90 DAP. It appeared from the result that Asterix is high yielding variety among these three and 90 days after planting is optimum time for harvesting its tuber as temperature remained at optimum range. Download


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